diff --git a/.gitignore b/.gitignore
index ea64c96f79..3900d8c2ff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,6 +11,7 @@ test/tmp
 coverage
 dist
 .package.json
+packages/babel-runtime/*.js
 packages/babel-runtime/helpers/*.js
 packages/babel-runtime/regenerator/*.js
 lib
diff --git a/packages/babel-runtime/core-js.js b/packages/babel-runtime/core-js.js
deleted file mode 100644
index 709f7e3252..0000000000
--- a/packages/babel-runtime/core-js.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("core-js/library");